MimeKit.MimeMessage.TryGetMultipartBody C# (CSharp) Method

		static bool TryGetMultipartBody (Multipart multipart, TextFormat format, out string body)
		{
			var alternative = multipart as MultipartAlternative;

			if (alternative != null) {
				body = alternative.GetTextBody (format);
				return body != null;
			}

			var related = multipart as MultipartRelated;
			Multipart multi;
			TextPart text;

			if (related == null) {
				// Note: This is probably a multipart/mixed... and if not, we can still treat it like it is.
				for (int i = 0; i < multipart.Count; i++) {
					multi = multipart[i] as Multipart;

					// descend into nested multiparts, if there are any...
					if (multi != null) {
						if (TryGetMultipartBody (multi, format, out body))
							return true;

						// The text body should never come after a multipart.
						break;
					}

					text = multipart[i] as TextPart;

					// Look for the first non-attachment text part (realistically, the body text will
					// preceed any attachments, but I'm not sure we can rely on that assumption).
					if (text != null && !text.IsAttachment) {
						if (text.IsFormat (format)) {
							body = MultipartAlternative.GetText (text);
							return true;
						}

						// Note: the first text/* part in a multipart/mixed is the text body.
						// If it's not in the format we're looking for, then it doesn't exist.
						break;
					}
				}
			} else {
				// Note: If the multipart/related root document is HTML, then this is the droid we are looking for.
				var root = related.Root;

				text = root as TextPart;

				if (text != null) {
					body = text.IsFormat (format) ? text.Text : null;
					return body != null;
				}

				// maybe the root is another multipart (like multipart/alternative)?
				multi = root as Multipart;

				if (multi != null)
					return TryGetMultipartBody (multi, format, out body);
			}

			body = null;

			return false;
		}